Sometimes it is hard to know what to shoot that will be new and/or different. We tend to get in ruts and just shoot the same thing over and over again because it works. That may be okay for a strictly commercial venture (but it can soon get old). Or maybe we just find ourselves with a model in front of us and a set, but no idea what to do to make use of that set.
What I often do, is to go through my old files of photo sessions I've had and look at grab shots, outtake shots, idea shots, etc to see if I can get ideas for the next shoot. I often annotate such shots, and print out a copy, so I can use it to direct the model. Following is an example, of what I call a concept or idea shot. It was something I was playing around with on the set, but didn't have time to carry to completion (there were three models, and I had to get a certain set of photos of each). But during the shots used to get the lighting setup and the WB set, etc, I took this one:
As you can see it had a dirty mirror and no real point of focus. So I annotated things I'd need to pay attention to when I actually use the idea later.
Tip: The focus on a shot like this is to focus on the eyes in the mirror you want to have the most attention.